James e



(No Model.)

' J. E. GIBSON.

NUT LOCK. No. 290.638. Patented Dec. 18, 1883.

I WITNESSES iAIg/VTOR I I W w @flz Z jag Attorney UNITED STATES PATENT FFICE.

JAMES E. GIBSON ,OF WINONA,-MISSISSIPPI, ASSIGNOR OF TWO-THIRDS TO JAMES C. PURNELL AND A. B. WADDINGTON, BOTH OF SAME PLACE.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 290,638, dated December 18, 188 3.

secured within one side of the nut, the innerend of the pawl being made to catch into longitudinal grooves in the bolt, as will be hereinafter more fully described.

To enable those skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

In the annexed drawings, making part of this specification, Figure 1 represents a plan view, and Fig. 2 a cross-section, of the nut,

' taken on the line 00.

In the figures, A represents a bolt of ordinary construction, except that its threaded portion is provided with one or more grooves made longitudinally of it.

B represents the nut formed to pass over this bolt. The peculiarity of this nut is that tion of its two arms.

Application filed November 8, 1883. (No model.)

arm of the pawl, and resting upon a ledge of the opening 6, and within the nut, is a spring, d. This spring maybe in spiral or other suitable form. The other arm of the pawl reaches down through the opening to the bolt, and engages normally with the grooves in the bolt. The end of the arm under which the spring lies extends just above the surface of the nut, so that when it is desirable to disengage the lower or inner end from the grooves of the bolt all that is necessary to do is to press the grooved bolt, a nut having a rectangular central opening formed in one edge, a bell-crank pawl fitted therein, and aspiral spring resting upon a ledge in the opening and bearing against the outer arm of the pawl, substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES E. GIBSON;

Witnesses:

J. R. ELLETT, F. R. HAWKINS. 

